Reenforced concrete building frame construction

ABSTRACT

In the reinforced concrete frame for a building consisting essentially of columns assembled with horizontal beams and with floor units extending between adjacent parallel beams, the beams and floor units are precast for assembly on the building site. According to the invention, in order to provide a simple but strong connection between the beams and columns a bracket consisting of a hollow steel joist section embedded in a column and projecting laterally is received within a channel-shaped steel shoe embedded in the end of the beam in interfitting relation on assembly of the beams and columns. To ensure accurate alignment and eliminate possible canting of the beam a second length of channel-shaped steel section is embedded in the column above said bracket and receives a tubular steel section secured to and projecting from the end of the beam upon assembly of the shoe and bracket. A stuff bar pushed through the tubular section may serve to connect two beams similarly supported on opposite sides of a column. The shoe and tubular section are welded to reinforcing bars, while floor units of double T-shaped cross section, the ends of which rest on flanges of the beams, are also secured by welding reinforcing elements thereof to reinforcing bars extending laterally from the beams.

United States Patent [72] Inventors Hugh Mary Clyne 25, Sion Road,Glenageary; Peter Joseph Faherty, Park Avenue, Daleplort Road, Salthill,Galway, both of, Ireland [2].] Appl. No. 808,532 [22] Filed Mar. 19,1969 [45] Patented Sept. 14, 1971 [32] Priority Mar. 22, 1968 [33]Ireland [31 335/68 [54] REENFORCED CONCRETE BUILDING FRAME CONSTRUCTION5 Claims, 11 Drawing Figs.

[52] U.S. Cl 52/283, 52/250, 52/322, 52/491 [5 1] Int. Cl E04b 5/04,E04b 5/23 [50] Field of Search"; 52/236, 263, 283, 252, 251, 280, 721,299, 253, 491, 587, 250, 322

[56] References Cited UNITED STATES PATENTS 2,569,669 10/195 I Henderson52/238 2,970,676 2/l96l -Maciunas 52/280 Primary E.raminer.lohn E.Murtagh Attorney-Mason, Fenwick & Lawrence ABSTRACT: In the reinforcedconcrete frame for a building consisting essentially of columnsassembled with horizontal beams and with floor units extending betweenadjacent parallel beams, the beams and floor units are precast forassembly on the building site. According to the invention, in order toprovide a simple but strong connection between the beams and columns abracket consisting of a hollow steel joist section embedded in a columnand projecting laterally is received within a channel-shaped steel shoeembedded in the end of the beam in interfitting relation on assembly ofthe beams and columns. To ensure accurate alignment and eliminatepossible canting of the beam a second length of channel-shaped steelsection is embedded in the column above said bracket and receives atubular steel section secured to and projecting from the end of the beamupon assembly of the shoe and bracket. A stuff bar pushed through thetubular section may serve to connect two beams similarly supported onopposite sides of a column. The shoe and tubular section are welded toreinforcing bars, while floor units of double T-shaped cross section,the ends of which rest on flanges of the beams, are also secured bywelding reinforcing elements thereof to reinforcing bars extendinglaterally from the beams.

- PATENTED-SEPI 4:971

SHEET 1 BF 3 "YVE/VTORS HUGH MARY CLYNE Q PETER Iosapu FAHeR-w PATENIEUSEP] 4 1971 shin 3 or 3 V llVVEWTORS Huau MARY Vic-urns pews-z JosapuFAHE meu MJW REENFORCED CONCRETE BUILDING FRAME CONSTRUCTION Thisinvention concerns improvements in the construction of reinforcedconcrete frames for buildings of the kind comprising columns whichsupport the ends of transverse beams. which in turn are intended tocarry the floor plates spanning from beam to beam, and is particularlyconcerned with frames for multistory buildings.

The object of the invention-is to simplify and improve the constructionof the parts and to'facilitate their erection so that a strong andendurable structure may be obtained. For this purpose particular regardis paid to the manner of connecting together the parts which make up theframed structure;

In the construction of a building frame ofthe kind referred to employingbeams which are precast and not cast in situ, it is usual to providebrackets upon the columns to receive and support the ends of the beamswhichextendfrom column to column. According to one feature of theinvention a bracket: upon a column to support the end of a beam'isconstructed by a steel joist section which may be of inverted channelshape, but is preferably tubular, portion being embedded in thereinforced concrete column while a portion projects laterally to;

. ing.

FIG. 9 shows to a reduced scale and diagrammatically a suitablearrangement of the reinforcement provided in a beam and'in the endportion of a floor element resting thereon.

In some of the views partsof the reinforcement are. not shown for thesake of clarity.

Referring toth'e drawings, the reinforced concrete frame of a buildingaccordingto the invention consists essentially of columns 1 and beams 2,the latter being bridged by floor members 3. A shear wall 4-(FlG. 10)also of reinforced concrete provide a step, over which will fit aninverted channel-shaped:

steel shoe which is at least partially embedded in the concrete of theend of the beam but is open of access on the underside. It is preferablywelded to longitudinal reinforcement bars of the beam. If the column isintended to support beams on both sides thereof the bracket sectionpasses, completely through the column, a portion projecting on oppositesides thereof to provide the beam supports.

According to a further feature of the invention means are provided atthe end of the beam, spaced somewhat from the. shoe above referred to,and adapted to register with corresponding means provided upon thecolumn to ensure a predetermined alignment and eliminate any possibletwisting. or lateral tilting of the beam. Such means advantageouslyconsist of interfitting steel members, preferably ashort length ofchannel-shaped or tubular rolled steel section embedded in the columnwith its longitudinal axis horizontal and with one or each endprojecting laterally from the side of the column and adapted tocooperate in interfitting relation with a corresponding tubular orchannel-shaped steel section cast in the end of the beam. Thearrangement is such that when placing the end of a beam in position sothat the shoe restsupon the bracket the beam is first suspended with itsend more or less in contact with the column, but above the desired finalposition, and as the beam is lowered the shoe comes to rest upon the.bracket at the same time as the members constituting the registeringmeans above referred to come togetherin nesting relation, one within thechannel ofthe other. The floors of the building preferably consist ofreinforced concrete members of double T-shaped cross section, the endsof which rest on laterally extending flanges of the beams, the latterhaving laterally projecting reinforcement bars-which are welded to theupper projecting portions of stirrups of reinforcement bars embedded inthe end portions of said floor members.

The invention is hereinafter more fully described with reference to theaccompanying drawings, wherein:

FIG. 1 is an isometric view of portion of the floor and frame ofabuilding as seen from below FIGS. 2,3 and 4 are similar isometric viewsshowing respective portions of FIG. 1 in unassembled condition FIG. 5 isan isometric view from above of the end portion of the beam shown inFIG. 3,

FIG. 6 is a similar isometric view of a column and beam in assembledrelation FIG. 7 is an isometric view corresponding to FIG. 2, but to alar er scale showing in full lines the metal members embedded serves tostiffen the structure.

The columns 1 are of substantially T-shaped in horizontal cross.section, while the beams 2, at least those which. are located at thesides of the frame, are of L-shaped cross section so as to provideledgesor rabbets to receive the ends of the floor plates 3. It willv beunderstood, however, that where horizontal beams are required to bearranged intermediately in the frame, to serve as so-called spine beamsand are required to'support the ends of floor plates extending from bothsides thereof, said beams will be of T-shaped cross section and arrangedwith the flanges at the bottom.

In order to connect the beams 2 with the columns I,

brackets or steps in the form of tubular steel sections 5 are partiallyembedded inthe columns 1, and where the columns are required to supportbeams 2 on both sides the sections 5 extend completely through thecolumns 1 and project on both sides as shown most clearly in FIG. 4.Spaced somewhat above the brackets 5 are further steel sections 6,preferably of U- shaped cross section. These are not required to supportthe weight of thebeams 2, andtherefore may be substantially smaller thanthe membersS.

In the end of the'beam 2 there is embedded at the bottom a shoe 7 ofsuch size asto fit snugly over the bracket 5, while a second rolledsteel tube portion 8 is disposed at the top of the beam 2 and is adaptedto engage the section 6 when the shoe 7 engages the step 5 on placingthe beam in its assembled position in relation to'the column 1 which isto support it. The sections 8 and 5 are preferably securely held inposition at the end of the beam 2 by the provision of stirrups 9 (FIG.7) welded thereto. 'The shoe 7 is also preferably welded to thelongitudinal reinforcement bars 10 of the beam 2. When the beam is inthe desired position a stuffing bar 11 is passed through the tubularmember 8. It is advantageously welded to said member and also grouted toform a firm connection between the column 1 and the beams 2 on each sidethereof.

The floor plates 3 are preferably of double T-shaped cross section,suitably reinforced and at their ends are provided with sole plates 12adapted to sit upon corresponding bearing plates 13 provided on theflanges of the beam 2. The sole plates 12 may be welded to the bearingplates 13. The reinforcement in the end portions of the webs of thefloor plates 3 preferably comprises stirrups 14, as shown in FIGS. 8 and9, which at the bottom are welded to the sole plates 12 at the topproject above the upper surface of the beam and are welded toreinforcement bars 15 provided for that purpose and extending laterallyfrom the beam 2. Similarly where a floor plate 3 which is relativelyeasy to set up, a particularly strong andrigid frame is obtained and anytwisting moments exerted on the beams due to d'eflection of the floorplates when loaded 1. In or for a building frame, a reinforced concretecolumn, a bracket consisting of a hollow steel section embedded in andprojecting laterally from said column, a length of channelshaped steelsection embedded in said column and projecting laterally therefrom abovesaid bracket, a reinforced concrete beam for assembly with said columnperpendicularly thereto, a steel shoe of inverted channel shape embeddedin the end of said beam and open of access from below, a tubular steelsection secured to and projecting from the end of the beam above saidshoe, said shoe receiving said bracket in interfitting relation and saidchannel-shaped steel section receiving said tubular section ininterfitting relation upon assembly of said column and beam.

2. In or for a building frame as claimed in claim 1, reinforcing barsextending as stirrups between and welded to the shoe and to the tubularsteel section in the end portion of a beam, the beam also havinglongitudinal reinforcing bars welded to the shoe.

3 In or for a building frame, a reinforced concrete column, a bracketconsisting of a hollow steel section embedded in and projectinglaterally from said column, a length of channelshaped steel sectionembedded in said column and projecting laterally therefrom above saidbracket, a reinforced concrete beam for assembly with said columnperpendicularly thereto, a steel shoe of inverted channel shape embeddedin the end of said beam and open of access from below, a tubular steelsection secured to and projecting from the end of the beam above saidshoe, said shoe receiving said bracket in interfitting relation and saidchannel-shaped steel section received said tubular steel section ininterfitting relation upon assembly of said column and beam, and a stuffbar inserted through said tubular steel section for contract with saidchannel-shaped steel section and secured at opposite ends to the beamand column.

4. In a building frame a reinforced concrete column, a

' bracket consisting of a hollow steel section embedded in andprojecting laterally from opposite sides of said column, a length ofchannel-shaped steel section embedded in and projecting laterally fromopposite sides of said column above said bracket, a pair of reinforcedconcrete beams for assembly with said column perpendicularly thereto, asteel shoe of inverted channel shape embedded in the end of each of saidbeams and open of access from below, a tubular steel section secured toand projecting from the end of each beam above said shoe, each of saidshoes receiving said bracket in interfitting relation and saidchannel-shaped steel section receiving each of said tubular steelsections in interfitting relationship upon assembly of said column andbeams, and a stuff bar inserted through said tubular steel section andsecured at opposite ends to the respective beams.

5. In a building frame as claimed in claim 4 a series of reinforcedconcrete beams and columns assembled together, said beams having bottomflanges extending laterally, reinforced concrete floor units of doubleT-shaped cross section supported at their ends upon said flanges andreinforcement bars extending laterally from the beams and welded toexposed portions of reinforcement bars partly embedded in the floorunits.

1. In or for a building frame, a reinforced concrete column, a bracketconsisting of a hollow steel section embedded in and projectinglaterally from said column, a length of channel-shaped steel sectionembedded in said column and projecting laterally therefrom above saidbracket, a reinforced concrete beam for assembly with said columnperpendicularly thereto, a steel shoe of inverted channel shape embeddedin the end of said beam and open of access from below, a tubular steelsection secured to and projecting from the end of the beam above saidshoe, said shoe receiving said bracket in interfitting relation and saidchannelshaped steel section receiving said tubular section ininterfitting relation upon assembly of said column and beam.
 2. In orfor a building frame as claimed in claim 1, reinforcing bars extendingas stirrups between and welded to the shoe and to the tubular steelsection in the end portion of a beam, the beam also having longitudinalreinforcing bars welded to the shoe.
 3. In or for a building frame, areinforced concrete column, a bracket consisting of a hollow steelsection embedded in and projecting laterally from said column, a lengthof channel-shaped steel section embedded in said column and projectinglaterally therefrom above said bracket, a reinforced concrete beam forassembly with said column perpendicularly thereto, a steel shoe ofinverted channel shape embedded in the end of said beam and open ofaccess from below, a tubular steel section secured to and projectingfrom the end of the beam above said shoe, said shoe receiving saidbracket in interfitting relation and said channel-shaped steel sectionreceived said tubular steel section in interfitting relation uponassembly of said column and beam, and a stuff bar inserted through saidtubular steel section for contract with said channel-shaped steelsection and secured at opposite ends to the beam and column.
 4. In abuilding frame a reinforced concrete column, a bracket consisting of ahollow steel section embedded in and projecting laterally from oppositesides of said column, a length of channel-shaped steel section embeddedin and projecting laterally from opposite sides of said column abovesaid bracket, a pair of reinforced concrete beams for assembly with saidcolumn perpendicularly thereto, a steel shoe of inverted channel shapeembedded in the end of each of said beams and open of access from below,a tubular steel section secured to and projecting from the end of eachbeam above said shoe, each of said shoes receiving said bracket ininterfitting relation and said channel-shaped steel section receivingeach of said tubular steel sections in interfitting relationship uponassembly of said column and beams, and a stuff bar inserted through saidtubular steel section and secured at opposite ends to the respectivebeams.
 5. In a building frame as claimed in claim 4 a series ofreinforced concrete beams and columns assembled together, said beamshaving bottom flanges extending laterally, reinforced concrete floorunits of double T-shaped cross section supported at their ends upon saidflanges and reinforcement bars extending laterally from the beams andwelded to exposed portions of reinforcement bars partly embedded in thefloor units.